The polarity of ethyl acetate and dichloromethane is related to its molecular structure, charge distribution, and plays a key role in chemistry, such as separation and dissolution. The polarity of ethyl acetate (Ethyl Acetate) and dichloromethane (DCM) is analyzed to illustrate the difference between the two.

Ethyl acetate, its molecular formula is $C_ {4} H_ {8} O_ {2} $, and its structure contains carbonyl and ethoxy. In carbonyl, the electronegativity between carbon and oxygen is special, and the electronegativity of oxygen is strong. The electron cloud is biased towards oxygen, which makes carbonyl carbon positive and carbonyl oxygen negative. This is the source of polarity. And the carbon-oxygen bond in ethoxy is also polar, but it is relatively weak compared to carbonyl. In general, ethyl acetate has a certain polarity due to its carbonyl group.

Dichloromethane, the molecular formula is $CH_ {2} Cl_ {2} $, and the molecular configuration is tetrahedral. The electronegativity of chlorine is greater than that of carbon, and the electron cloud between carbon-chlorine bonds is biased towards chlorine, resulting in uneven charge distribution in the molecule. Although the molecule has a certain symmetry, the distribution of dichlorine atoms makes the whole still polar. However, compared with ethyl acetate, dichloromethane molecules are relatively compact, and although the polarity of carbon-chlorine bonds is strong, the overall charge separation degree is inferior to that caused by carbonyl groups in ethyl acetate.

In summary, in terms of polarity, ethyl acetate is more polar than dichloromethane. Due to the significant role of carbonyl polarity in ethyl acetate, the degree of charge separation is large; although dichloromethane has polarity due to carbon-chlorine bonds, its molecular structure and charge distribution make its polarity weaker. In chemical practice, it is clear that the polarity difference between the two can help to select suitable solvents for separation and reaction.